Comprehensive Description

Description of Centropyxis aculeata

Testate amoeba, test discoidal, flat, somewhat beret-shaped; dorsal surface rounded, ventral flat to concave; aperture ventral, may be circular to uneven but displaced towards one end; fine spines present on edge, may be at one end only or all around the periphery; surface smooth, dorsally with many quartz grains and a little cement, ventrally polished-looking due to more cement and much smaller grains in test. Length of shell 92-178 microns, breadth of shell 77-137 microns, depth of shell 40-72 microns and diameter of aperture 31-30 microns.